261212128 has 24 divisors (see below), whose sum is σ = 515628288. Its totient is φ = 130258944.

The previous prime is 261212117. The next prime is 261212129. The reversal of 261212128 is 821212162.

261212128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261212129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600 + ... + 22912.

It is an arithmetic number, because the mean of its divisors is an integer number (21484512).

Almost surely, 2^261212128 is an apocalyptic number.

It is an amenable number.

261212128 is a deficient number, since it is larger than the sum of its proper divisors (254416160).

261212128 is a wasteful number, since it uses less digits than its factorization.

261212128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21706 (or 21698 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 261212128 is about 16162.0582847606. The cubic root of 261212128 is about 639.2407402384.

The spelling of 261212128 in words is "two hundred sixty-one million, two hundred twelve thousand, one hundred twenty-eight".